Fuel pumping device for internal combustion engines



F. G. scHwElsTl-IAL 1,834,977 A FUEL PUHPING'DEVICE FOR INTERNAL COMBUSTION ENGINES Filed Deel 5, .1927

Patented Dec. 8, 1931 UNITED STATES PATENT OFFICE FRED G. SCHWEISTHAL, 0F CHICAGO, ILLINOIS, ASSIGNOR '1.0 STEWART-WARNER COR- PORATION, 0F CHICAGO, ILLINOIS, A CORPORATION OF VIRGINIA FUEL PUMPING DEVICE FOR INTERNAL COMBUSTION ENGINES Application iled December 5, 1927. Serial No. 237,809.

The purpose of this invention is to provide an improved and economically constructed device for pumping fuel to the carbui'eter of a motor vehicle engine from the 5 main fuel supply tank located at a lower level than the carbureter, utilizing for that purpose the engine ignition circuit and specifically the ignition coil in which the interruptions of the circuit, alternately energiz- 10 ing and (le-energizing the magnetic core,

adapts the latter to constitute means for producing vibration or pulsation of a member which thereby may become apumping element by association with suitable valves and condi its. The invention consists in the elements and features of constructionl shown and described as indicated in the claims.

In the drawings Figure 1 is a diagrammatic view for showing in their rela-tive positions on the vehicle, the main fuel supply tank, the carbureter and the pump device of this invention.

Figure 2 is an elevation of the engine ignition coil with its casing and with the device exemplifying this invention mounted on the casing, said device and the adjacent part of the ignition coil and casing being in section axial with respect to said coil and said device, the connection of the device to the main fuel tank and the carbureter float bowl or like fuel receptacle being shown diagrammatically.

Figure 3 is a plan view as at the plane indicated bv the line 3 3 on Figure 2 on a reduced scale. s Y

Figure 4 is a wiring diagram of the construction shown in Figure 2.

In the structure illustrated, A is the main fuel supply tank at a lowerlevel than the carbureter shown at B. C is the engine ignition coil which is shown with a casing, 20, having at its lower end an outwardly turned flange, 21, approximately in the plane of the end of the core member, 30, ot the primary winding indicated at 4() of the ignition circuit transformer commonly called the ignition coil. D is a cast plate having a flat face on one side and at the other side having a marginal flange, 50, dimensioned for encompassing the flange, 21, of the casing 20 and forming a recess or cavity at the side of the plate, D, from which said fiange projects. Through said fiat face, 51, of said plate, ports, 52 and 53, open into the cavity bounded by the flange, 50, and from the peripheral edge of the plate the ducts, 54 and 54a, in the plate, D, lead to the ports, 52 and 53, respectively, said duct-s being interiorly threaded at their entrances in the periphery of the plate for pipe connections, 80 and 90, leading respectively to the main fuel supply tank and to the immediate fuel source of' the earbureter. The ports, 52 and 53, are encompassed by recesses, 55 and 56, respectively, for accommodating check valves, 57 and 58, seating respectively against outflow and inilow and opening respectively for inflow and outiow with respect to the cavity formed at the inner side of the plate, the port, 53, being for this purpose furnished with a valve seat disk, 60, mounted over the recess, 56, and having a port, 53a, at which the valve, 58, seats upwardly against inflow.

E is a iexible diaphragm which may be inherently resilient, and which is shown associated with a spring, F, for resilient reaction independently of any inherent resiliency of the diaphragm. This diaphragm is diametered for being marginally clamped between the end of the casing, C, and the margin within the flange, 50, of the fiat face, 51, of the plate, D, and spaced from both the clamping margins of both said parts by the spacing means indicated at 41 and 42, each being of' suitable thickness to space the center ot the diaphragm at its normal position away from the end of the core, and also away from the opposite inner face of the casing, C, both said spacing means heilig adapted to make the junction of the diaphragm with the. parts between which it is clamped airtight. As shown, the spacing means, 41, is an annular iron disk which extends over a considerable annular area of the diaphragm having a central apertureof suiiicient diameter to accommodate a spirally-coiled spring, F, said disk, 41 being flexed toward the solenoid and away from the diaphragm within the annular margin by which it is clamped ,Y to allow ample room for the flexture of the diaphragm toward ,the solenoid core. The diaphragm, E, may consist of certain wellknown impregnated fabric or of paramagnetic metal as steel, but if as on sonnev accounts preferable, it is made of'diamagnetic metal, such as brass or aluminum, or if made of the impregnated fabric mentioned, itv will be -fnrnished with a central part of pararmav tion of the diaphragm will force the fluid-so sor drawn in through said port, 52, out through the port, 53, toward the carbureter which will be thus supplied with fuel for-operating the engine as long as the engine ignition circuit is operated for ignitingthe fuel mixture andcausing it to operate the engine'.l y

I claim: 1. In combination with of an internal combustion' engine a member having a chamber of which one wall is formed by a diaphragm construction adapted at lts central part to respond to magnetic attraction and react resiliently, said chamber being mounted at one end of the ignition coil with the diaphragms'paced from the pole ofthe core of the coil, said member having an inlet duct and an outlet duct,check valvescontrolling the ports to saidducts opening` respectively for inflow and outflow and seating respectively against outflow and inflow, the

etic l metal which may be in the form, as s own, of a button, 7 0, mounted fixedly at vthe centhe ignition coil With the vignition circuit and the ignition coil unit, including its casing andcore, of a fuel feeding magnetically operated pump having a pumping chamber mounted o`n the ignition coil casing and comprisingas the pumping member a flexible diaphragm, the ignition coil casing having-for such mounting an out- Wardly projecting Vannular flange dimensioned 4for cooperating .with the marginal annular area of the pumping 'chamber for clamping the diaphragm pumping member between the pumping chamber body and said flange; means associated with said flange for spacing the diaphragm therefrom and rendering the junction of the diaphram therewith air-tight for making air-tight the cham- -berlof which the diaphragm constitutes a Wal 5. In a liquid fuel feeding system for internal combustion engines, the combination with the ignition circuit the ignition coil and its core, of a fuel feedmg magnetically operated pump having its pumping l member provided with an armature for co-action with the core.

' In testimony `whereof, I have hereunto set my handthis 18th day' of November, 1927. FRED G. SCHWEISTHAL.

inlet duct being adapted for connection to a chamber in Vwhich partial vacuum is to be produced.

2. In a liquid fuel feeding system for internal combustion engines, the combination with the ignition circuit for the engine, the ignition coil and its core, and a magnetic head on said core exterior of the coil, of a pump casin having an operating member therein inclu ing an armature, and said head located in operative relationship to said armature. .3. In a liquid fuel feeding system for internal combustion engines, the combination with the ignition circuit and the ignition coil unit including its core, of a fuel feeding magnetically operated pump comprising as the pumping member a. iexlble diaphragm, said diaphragm having fixed to it an armature for s coaction whzh said core by responding to mag- 

